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<title>class ErrorHighlight::Spotter - error_highlight: Ruby Standard Library Documentation</title>


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  <h3>Parent</h3>

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<!-- Method Quickref -->
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  <h3>Methods</h3>

  <ul class="link-list" role="directory">
    <li ><a href="#method-c-new">::new</a>
    <li ><a href="#method-i-fetch_line">#fetch_line</a>
    <li ><a href="#method-i-spot">#spot</a>
    <li ><a href="#method-i-spot_attrasgn_for_args">#spot_attrasgn_for_args</a>
    <li ><a href="#method-i-spot_attrasgn_for_name">#spot_attrasgn_for_name</a>
    <li ><a href="#method-i-spot_call_for_args">#spot_call_for_args</a>
    <li ><a href="#method-i-spot_call_for_name">#spot_call_for_name</a>
    <li ><a href="#method-i-spot_colon2">#spot_colon2</a>
    <li ><a href="#method-i-spot_fcall_for_args">#spot_fcall_for_args</a>
    <li ><a href="#method-i-spot_fcall_for_name">#spot_fcall_for_name</a>
    <li ><a href="#method-i-spot_op_asgn1_for_args">#spot_op_asgn1_for_args</a>
    <li ><a href="#method-i-spot_op_asgn1_for_name">#spot_op_asgn1_for_name</a>
    <li ><a href="#method-i-spot_op_asgn2_for_args">#spot_op_asgn2_for_args</a>
    <li ><a href="#method-i-spot_op_asgn2_for_name">#spot_op_asgn2_for_name</a>
    <li ><a href="#method-i-spot_op_cdecl">#spot_op_cdecl</a>
    <li ><a href="#method-i-spot_opcall_for_args">#spot_opcall_for_args</a>
    <li ><a href="#method-i-spot_opcall_for_name">#spot_opcall_for_name</a>
    <li ><a href="#method-i-spot_vcall">#spot_vcall</a>
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    <div id='extraz'><div class='adzbox-index'  >
      
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    <main role="main" aria-labelledby="class-ErrorHighlight::Spotter">
    <h1 id="class-ErrorHighlight::Spotter" class="class">
      class ErrorHighlight::Spotter
    </h1>

    <section class="description">
    
    </section>

      <section id="5Buntitled-5D" class="documentation-section">


      <section class="constants-list">
      <header>
      <h3>Constants</h3>
      </header>
      <dl>
          <dt id="OPT_GETCONSTANT_PATH">OPT_GETCONSTANT_PATH
          <dd>
        </dl>
        </section>



                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">(node, point_type: :name, name: nil)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 79</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">node</span>, <span class="ruby-value">point_type:</span> <span class="ruby-value">:name</span>, <span class="ruby-value">name:</span> <span class="ruby-keyword">nil</span>)
  <span class="ruby-ivar">@node</span> = <span class="ruby-identifier">node</span>
  <span class="ruby-ivar">@point_type</span> = <span class="ruby-identifier">point_type</span>
  <span class="ruby-ivar">@name</span> = <span class="ruby-identifier">name</span>

  <span class="ruby-comment"># Not-implemented-yet options</span>
  <span class="ruby-ivar">@arg</span> = <span class="ruby-keyword">nil</span> <span class="ruby-comment"># Specify the index or keyword at which argument caused the TypeError/ArgumentError</span>
  <span class="ruby-ivar">@multiline</span> = <span class="ruby-keyword">false</span> <span class="ruby-comment"># Allow multiline spot</span>

  <span class="ruby-ivar">@fetch</span> = <span class="ruby-operator">-&gt;</span> (<span class="ruby-identifier">lineno</span>, <span class="ruby-identifier">last_lineno</span> = <span class="ruby-identifier">lineno</span>) <span class="ruby-keyword">do</span>
    <span class="ruby-identifier">snippet</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">script_lines</span>[<span class="ruby-identifier">lineno</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span> <span class="ruby-operator">..</span> <span class="ruby-identifier">last_lineno</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>].<span class="ruby-identifier">join</span>(<span class="ruby-string">&quot;&quot;</span>)
    <span class="ruby-identifier">snippet</span> <span class="ruby-operator">+=</span> <span class="ruby-string">&quot;\n&quot;</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">snippet</span>.<span class="ruby-identifier">end_with?</span>(<span class="ruby-string">&quot;\n&quot;</span>)

    <span class="ruby-comment"># It require some work to support Unicode (or multibyte) characters.</span>
    <span class="ruby-comment"># Tentatively, we stop highlighting if the code snippet has non-ascii characters.</span>
    <span class="ruby-comment"># See https://github.com/ruby/error_highlight/issues/4</span>
    <span class="ruby-identifier">raise</span> <span class="ruby-constant">NonAscii</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">snippet</span>.<span class="ruby-identifier">ascii_only?</span>

    <span class="ruby-identifier">snippet</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-spot" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="spot-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 104</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot</span>
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">unless</span> <span class="ruby-ivar">@node</span>

  <span class="ruby-keyword">if</span> <span class="ruby-constant">OPT_GETCONSTANT_PATH</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">type</span> <span class="ruby-operator">==</span> <span class="ruby-value">:COLON2</span>
    <span class="ruby-comment"># In Ruby 3.2 or later, a nested constant access (like `Foo::Bar::Baz`)</span>
    <span class="ruby-comment"># is compiled to one instruction (opt_getconstant_path).</span>
    <span class="ruby-comment"># @node points to the node of the whole `Foo::Bar::Baz` even if `Foo`</span>
    <span class="ruby-comment"># or `Foo::Bar` causes NameError.</span>
    <span class="ruby-comment"># So we try to spot the sub-node that causes the NameError by using</span>
    <span class="ruby-comment"># `NameError#name`.</span>
    <span class="ruby-identifier">subnodes</span> = []
    <span class="ruby-identifier">node</span> = <span class="ruby-ivar">@node</span>
    <span class="ruby-keyword">while</span> <span class="ruby-identifier">node</span>.<span class="ruby-identifier">type</span> <span class="ruby-operator">==</span> <span class="ruby-value">:COLON2</span>
      <span class="ruby-identifier">node2</span>, <span class="ruby-identifier">const</span> = <span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>
      <span class="ruby-identifier">subnodes</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">node</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">const</span> <span class="ruby-operator">==</span> <span class="ruby-ivar">@name</span>
      <span class="ruby-identifier">node</span> = <span class="ruby-identifier">node2</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">node</span>.<span class="ruby-identifier">type</span> <span class="ruby-operator">==</span> <span class="ruby-value">:CONST</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">node</span>.<span class="ruby-identifier">type</span> <span class="ruby-operator">==</span> <span class="ruby-value">:COLON3</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>.<span class="ruby-identifier">first</span> <span class="ruby-operator">==</span> <span class="ruby-ivar">@name</span>
        <span class="ruby-identifier">subnodes</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">node</span>
      <span class="ruby-keyword">end</span>

      <span class="ruby-comment"># If we found only one sub-node whose name is equal to @name, use it</span>
      <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">subnodes</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">!=</span> <span class="ruby-value">1</span>
      <span class="ruby-ivar">@node</span> = <span class="ruby-identifier">subnodes</span>.<span class="ruby-identifier">first</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-comment"># Do nothing; opt_getconstant_path is used only when the const base is</span>
      <span class="ruby-comment"># NODE_CONST (`Foo`) or NODE_COLON3 (`::Foo`)</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">case</span> <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">type</span>

  <span class="ruby-keyword">when</span> <span class="ruby-value">:CALL</span>, <span class="ruby-value">:QCALL</span>
    <span class="ruby-keyword">case</span> <span class="ruby-ivar">@point_type</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:name</span>
      <span class="ruby-identifier">spot_call_for_name</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:args</span>
      <span class="ruby-identifier">spot_call_for_args</span>
    <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">when</span> <span class="ruby-value">:ATTRASGN</span>
    <span class="ruby-keyword">case</span> <span class="ruby-ivar">@point_type</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:name</span>
      <span class="ruby-identifier">spot_attrasgn_for_name</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:args</span>
      <span class="ruby-identifier">spot_attrasgn_for_args</span>
    <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">when</span> <span class="ruby-value">:OPCALL</span>
    <span class="ruby-keyword">case</span> <span class="ruby-ivar">@point_type</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:name</span>
      <span class="ruby-identifier">spot_opcall_for_name</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:args</span>
      <span class="ruby-identifier">spot_opcall_for_args</span>
    <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">when</span> <span class="ruby-value">:FCALL</span>
    <span class="ruby-keyword">case</span> <span class="ruby-ivar">@point_type</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:name</span>
      <span class="ruby-identifier">spot_fcall_for_name</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:args</span>
      <span class="ruby-identifier">spot_fcall_for_args</span>
    <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">when</span> <span class="ruby-value">:VCALL</span>
    <span class="ruby-identifier">spot_vcall</span>

  <span class="ruby-keyword">when</span> <span class="ruby-value">:OP_ASGN1</span>
    <span class="ruby-keyword">case</span> <span class="ruby-ivar">@point_type</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:name</span>
      <span class="ruby-identifier">spot_op_asgn1_for_name</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:args</span>
      <span class="ruby-identifier">spot_op_asgn1_for_args</span>
    <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">when</span> <span class="ruby-value">:OP_ASGN2</span>
    <span class="ruby-keyword">case</span> <span class="ruby-ivar">@point_type</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:name</span>
      <span class="ruby-identifier">spot_op_asgn2_for_name</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:args</span>
      <span class="ruby-identifier">spot_op_asgn2_for_args</span>
    <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">when</span> <span class="ruby-value">:CONST</span>
    <span class="ruby-identifier">spot_vcall</span>

  <span class="ruby-keyword">when</span> <span class="ruby-value">:COLON2</span>
    <span class="ruby-identifier">spot_colon2</span>

  <span class="ruby-keyword">when</span> <span class="ruby-value">:COLON3</span>
    <span class="ruby-identifier">spot_vcall</span>

  <span class="ruby-keyword">when</span> <span class="ruby-value">:OP_CDECL</span>
    <span class="ruby-identifier">spot_op_cdecl</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@snippet</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@beg_column</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@end_column</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@beg_column</span> <span class="ruby-operator">&lt;</span> <span class="ruby-ivar">@end_column</span>
    <span class="ruby-keyword">return</span> {
      <span class="ruby-value">first_lineno:</span> <span class="ruby-ivar">@beg_lineno</span>,
      <span class="ruby-value">first_column:</span> <span class="ruby-ivar">@beg_column</span>,
      <span class="ruby-value">last_lineno:</span> <span class="ruby-ivar">@end_lineno</span>,
      <span class="ruby-value">last_column:</span> <span class="ruby-ivar">@end_column</span>,
      <span class="ruby-value">snippet:</span> <span class="ruby-ivar">@snippet</span>,
      <span class="ruby-value">script_lines:</span> <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">script_lines</span>,
    }
  <span class="ruby-keyword">else</span>
    <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span>
  <span class="ruby-keyword">end</span>

<span class="ruby-keyword">rescue</span> <span class="ruby-constant">NonAscii</span>
  <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="private-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Private Instance Methods</h3>
                </header>

                  <div id="method-i-fetch_line" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">fetch_line</span><span
                                class="method-args">(lineno)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="fetch_line-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 538</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">fetch_line</span>(<span class="ruby-identifier">lineno</span>)
  <span class="ruby-ivar">@beg_lineno</span> = <span class="ruby-ivar">@end_lineno</span> = <span class="ruby-identifier">lineno</span>
  <span class="ruby-ivar">@snippet</span> = <span class="ruby-ivar">@fetch</span>[<span class="ruby-identifier">lineno</span>]
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_attrasgn_for_args" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_attrasgn_for_args</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>x.foo = 1
        ^
x[42] = 1
  ^^^^^^^
x[] = 1
  ^^^^^</pre>

                              <div class="method-source-code" id="spot_attrasgn_for_args-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 316</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_attrasgn_for_args</span>
  <span class="ruby-identifier">nd_recv</span>, <span class="ruby-identifier">mid</span>, <span class="ruby-identifier">nd_args</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-identifier">fetch_line</span>(<span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">mid</span> <span class="ruby-operator">==</span> <span class="ruby-value">:[]=</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G[\s)]*\[/</span>, <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_column</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">0</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_lineno</span>
      <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_column</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">nd_args</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">first_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_lineno</span>
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">first_column</span>
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_column</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-comment"># TODO: support @arg</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_attrasgn_for_name" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_attrasgn_for_name</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>x.foo = 1
 ^^^^^^
x[42] = 1
 ^^^^^^</pre>

                              <div class="method-source-code" id="spot_attrasgn_for_name-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 290</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_attrasgn_for_name</span>
  <span class="ruby-identifier">nd_recv</span>, <span class="ruby-identifier">mid</span>, <span class="ruby-identifier">nd_args</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-operator">*</span><span class="ruby-identifier">nd_args</span>, <span class="ruby-identifier">_nd_last_arg</span>, <span class="ruby-identifier">_nil</span> = <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-identifier">fetch_line</span>(<span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">mid</span> <span class="ruby-operator">==</span> <span class="ruby-value">:[]=</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G[\s)]*(\[)/</span>, <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_column</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">1</span>)
    <span class="ruby-identifier">args_last_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">0</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last</span>.<span class="ruby-identifier">last_lineno</span>
      <span class="ruby-identifier">args_last_column</span> = <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last</span>.<span class="ruby-identifier">last_column</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">if</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/[\s)]*\]\s*=/</span>, <span class="ruby-identifier">args_last_column</span>)
      <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">0</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G[\s)]*(\.\s*#{ Regexp.quote(mid.to_s.sub(/=\z/, &quot;&quot;)) }\s*=)/</span>, <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_column</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">1</span>)
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">1</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_call_for_args" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_call_for_args</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>x.foo(42)
      ^^
x[42]
  ^^
x += 1
     ^</pre>

                              <div class="method-source-code" id="spot_call_for_args-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 275</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_call_for_args</span>
  <span class="ruby-identifier">_nd_recv</span>, <span class="ruby-identifier">_mid</span>, <span class="ruby-identifier">nd_args</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_args</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">first_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_lineno</span>
    <span class="ruby-identifier">fetch_line</span>(<span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">first_lineno</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">first_column</span>
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_column</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-comment"># TODO: support @arg</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_call_for_name" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_call_for_name</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>x.foo
 ^^^^
x.foo(42)
 ^^^^
x&amp;.foo
 ^^^^^
x[42]
 ^^^^
x += 1
  ^</pre>

                              <div class="method-source-code" id="spot_call_for_name-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 231</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_call_for_name</span>
  <span class="ruby-identifier">nd_recv</span>, <span class="ruby-identifier">mid</span>, <span class="ruby-identifier">nd_args</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-identifier">lineno</span> = <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span>
  <span class="ruby-identifier">lines</span> = <span class="ruby-ivar">@fetch</span>[<span class="ruby-identifier">lineno</span>, <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">last_lineno</span>]
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">mid</span> <span class="ruby-operator">==</span> <span class="ruby-value">:[]</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">lines</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G[\s)]*(\[(?:\s*\])?)/</span>, <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_column</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">1</span>)
    <span class="ruby-ivar">@snippet</span> = <span class="ruby-identifier">lines</span>[<span class="ruby-regexp">/.*\n/</span>]
    <span class="ruby-ivar">@beg_lineno</span> = <span class="ruby-ivar">@end_lineno</span> = <span class="ruby-identifier">lineno</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_args</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_lineno</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\s*\]/</span>, <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_column</span>)
        <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">0</span>)
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">lines</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G[\s)]*?\[\s*\]/</span>, <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_column</span>)
        <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">0</span>)
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">lines</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G[\s)]*?(\&amp;?\.)(\s*?)(#{ Regexp.quote(mid) }).*\n/</span>, <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_column</span>)
    <span class="ruby-identifier">lines</span> = <span class="ruby-node">$`</span> <span class="ruby-operator">+</span> <span class="ruby-node">$&amp;</span>
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-node">$2</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-string">&quot;\n&quot;</span>) <span class="ruby-operator">?</span> <span class="ruby-value">3</span> <span class="ruby-operator">:</span> <span class="ruby-value">1</span>)
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">3</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">i</span> = <span class="ruby-identifier">lines</span>[<span class="ruby-operator">..</span><span class="ruby-ivar">@beg_column</span>].<span class="ruby-identifier">rindex</span>(<span class="ruby-string">&quot;\n&quot;</span>)
      <span class="ruby-ivar">@beg_lineno</span> = <span class="ruby-ivar">@end_lineno</span> = <span class="ruby-identifier">lineno</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">lines</span>[<span class="ruby-operator">..</span><span class="ruby-ivar">@beg_column</span>].<span class="ruby-identifier">count</span>(<span class="ruby-string">&quot;\n&quot;</span>)
      <span class="ruby-ivar">@snippet</span> = <span class="ruby-identifier">lines</span>[<span class="ruby-identifier">i</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span><span class="ruby-operator">..</span>]
      <span class="ruby-ivar">@beg_column</span> <span class="ruby-operator">-=</span> <span class="ruby-identifier">i</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span>
      <span class="ruby-ivar">@end_column</span> <span class="ruby-operator">-=</span> <span class="ruby-identifier">i</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-ivar">@snippet</span> = <span class="ruby-identifier">lines</span>
      <span class="ruby-ivar">@beg_lineno</span> = <span class="ruby-ivar">@end_lineno</span> = <span class="ruby-identifier">lineno</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">mid</span>.<span class="ruby-identifier">to_s</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp">/\A\W+\z/</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">lines</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G\s*(#{ Regexp.quote(mid) })=.*\n/</span>, <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_column</span>)
    <span class="ruby-ivar">@snippet</span> = <span class="ruby-node">$`</span> <span class="ruby-operator">+</span> <span class="ruby-node">$&amp;</span>
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">1</span>)
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">1</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_colon2" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_colon2</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>Foo::Bar
   ^^^^^</pre>

                              <div class="method-source-code" id="spot_colon2-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 494</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_colon2</span>
  <span class="ruby-identifier">nd_parent</span>, <span class="ruby-identifier">const</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_parent</span>.<span class="ruby-identifier">last_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">last_lineno</span>
    <span class="ruby-identifier">fetch_line</span>(<span class="ruby-identifier">nd_parent</span>.<span class="ruby-identifier">last_lineno</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">nd_parent</span>.<span class="ruby-identifier">last_column</span>
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">last_column</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-ivar">@snippet</span> = <span class="ruby-ivar">@fetch</span>[<span class="ruby-ivar">@node</span>.<span class="ruby-identifier">last_lineno</span>]
    <span class="ruby-keyword">if</span> <span class="ruby-ivar">@snippet</span>[<span class="ruby-operator">...</span><span class="ruby-ivar">@node</span>.<span class="ruby-identifier">last_column</span>].<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/#{ Regexp.quote(const) }\z/</span>)
      <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">0</span>)
      <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">0</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_fcall_for_args" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_fcall_for_args</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>foo(42)
    ^^
foo 42
    ^^</pre>

                              <div class="method-source-code" id="spot_fcall_for_args-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 386</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_fcall_for_args</span>
  <span class="ruby-identifier">_mid</span>, <span class="ruby-identifier">nd_args</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_args</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">first_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_lineno</span>
    <span class="ruby-comment"># binary operator</span>
    <span class="ruby-identifier">fetch_line</span>(<span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">first_lineno</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">first_column</span>
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_column</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_fcall_for_name" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_fcall_for_name</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>foo(42)
^^^
foo 42
^^^</pre>

                              <div class="method-source-code" id="spot_fcall_for_name-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 372</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_fcall_for_name</span>
  <span class="ruby-identifier">mid</span>, <span class="ruby-identifier">_nd_args</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-identifier">fetch_line</span>(<span class="ruby-ivar">@node</span>.<span class="ruby-identifier">first_lineno</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/(#{ Regexp.quote(mid) })/</span>, <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">first_column</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">1</span>)
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">1</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_op_asgn1_for_args" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_op_asgn1_for_args</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>x[1] += 42
  ^^^^^^^^</pre>

                              <div class="method-source-code" id="spot_op_asgn1_for_args-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 439</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_op_asgn1_for_args</span>
  <span class="ruby-identifier">nd_recv</span>, <span class="ruby-identifier">mid</span>, <span class="ruby-identifier">nd_args</span>, <span class="ruby-identifier">nd_rhs</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-identifier">fetch_line</span>(<span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">mid</span> <span class="ruby-operator">==</span> <span class="ruby-value">:[]=</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G\s*\[/</span>, <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_column</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">0</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_rhs</span>.<span class="ruby-identifier">last_lineno</span>
      <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">nd_rhs</span>.<span class="ruby-identifier">last_column</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">nd_args</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">first_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_rhs</span>.<span class="ruby-identifier">last_lineno</span>
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">first_column</span>
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">nd_rhs</span>.<span class="ruby-identifier">last_column</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-comment"># TODO: support @arg</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_op_asgn1_for_name" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_op_asgn1_for_name</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>x[1] += 42
 ^^^    (for [])
x[1] += 42
     ^  (for +)
x[1] += 42
 ^^^^^^ (for []=)</pre>

                              <div class="method-source-code" id="spot_op_asgn1_for_name-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 414</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_op_asgn1_for_name</span>
  <span class="ruby-identifier">nd_recv</span>, <span class="ruby-identifier">op</span>, <span class="ruby-identifier">nd_args</span>, <span class="ruby-identifier">_nd_rhs</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-identifier">fetch_line</span>(<span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G[\s)]*(\[)/</span>, <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_column</span>)
    <span class="ruby-identifier">bracket_beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">1</span>)
    <span class="ruby-identifier">args_last_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">0</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_args</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_lineno</span>
      <span class="ruby-identifier">args_last_column</span> = <span class="ruby-identifier">nd_args</span>.<span class="ruby-identifier">last_column</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">if</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\s*\](\s*)(#{ Regexp.quote(op) })=()/</span>, <span class="ruby-identifier">args_last_column</span>)
      <span class="ruby-keyword">case</span> <span class="ruby-ivar">@name</span>
      <span class="ruby-keyword">when</span> <span class="ruby-value">:[]</span>, <span class="ruby-value">:[]=</span>
        <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">bracket_beg_column</span>
        <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-ivar">@name</span> <span class="ruby-operator">==</span> <span class="ruby-value">:[]</span> <span class="ruby-operator">?</span> <span class="ruby-value">1</span> <span class="ruby-operator">:</span> <span class="ruby-value">3</span>)
      <span class="ruby-keyword">when</span> <span class="ruby-identifier">op</span>
        <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">2</span>)
        <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">2</span>)
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_op_asgn2_for_args" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_op_asgn2_for_args</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>x.foo += 42
         ^^</pre>

                              <div class="method-source-code" id="spot_op_asgn2_for_args-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 482</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_op_asgn2_for_args</span>
  <span class="ruby-identifier">_nd_recv</span>, <span class="ruby-identifier">_qcall</span>, <span class="ruby-identifier">_attr</span>, <span class="ruby-identifier">_op</span>, <span class="ruby-identifier">nd_rhs</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_rhs</span>.<span class="ruby-identifier">first_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_rhs</span>.<span class="ruby-identifier">last_lineno</span>
    <span class="ruby-identifier">fetch_line</span>(<span class="ruby-identifier">nd_rhs</span>.<span class="ruby-identifier">first_lineno</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">nd_rhs</span>.<span class="ruby-identifier">first_column</span>
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">nd_rhs</span>.<span class="ruby-identifier">last_column</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_op_asgn2_for_name" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_op_asgn2_for_name</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>x.foo += 42
 ^^^     (for foo)
x.foo += 42
      ^  (for +)
x.foo += 42
 ^^^^^^^ (for foo=)</pre>

                              <div class="method-source-code" id="spot_op_asgn2_for_name-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 461</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_op_asgn2_for_name</span>
  <span class="ruby-identifier">nd_recv</span>, <span class="ruby-identifier">_qcall</span>, <span class="ruby-identifier">attr</span>, <span class="ruby-identifier">op</span>, <span class="ruby-identifier">_nd_rhs</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-identifier">fetch_line</span>(<span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G[\s)]*(\.)\s*#{ Regexp.quote(attr) }()\s*(#{ Regexp.quote(op) })(=)/</span>, <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_column</span>)
    <span class="ruby-keyword">case</span> <span class="ruby-ivar">@name</span>
    <span class="ruby-keyword">when</span> <span class="ruby-identifier">attr</span>
      <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">1</span>)
      <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">2</span>)
    <span class="ruby-keyword">when</span> <span class="ruby-identifier">op</span>
      <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">3</span>)
      <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">3</span>)
    <span class="ruby-keyword">when</span> <span class="ruby-value">:&quot;#{ attr }=&quot;</span>
      <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">1</span>)
      <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">4</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_op_cdecl" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_op_cdecl</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>Foo::Bar += 1
   ^^^^^^^^</pre>

                              <div class="method-source-code" id="spot_op_cdecl-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 512</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_op_cdecl</span>
  <span class="ruby-identifier">nd_lhs</span>, <span class="ruby-identifier">op</span>, <span class="ruby-identifier">_nd_rhs</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-operator">*</span><span class="ruby-identifier">nd_parent_lhs</span>, <span class="ruby-identifier">_const</span> = <span class="ruby-identifier">nd_lhs</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@name</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">op</span>
    <span class="ruby-ivar">@snippet</span> = <span class="ruby-ivar">@fetch</span>[<span class="ruby-identifier">nd_lhs</span>.<span class="ruby-identifier">last_lineno</span>]
    <span class="ruby-keyword">if</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G\s*(#{ Regexp.quote(op) })=/</span>, <span class="ruby-identifier">nd_lhs</span>.<span class="ruby-identifier">last_column</span>)
      <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">1</span>)
      <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">1</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-comment"># constant access error</span>
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">nd_lhs</span>.<span class="ruby-identifier">last_column</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_parent_lhs</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-comment"># example: ::C += 1</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_lhs</span>.<span class="ruby-identifier">first_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_lhs</span>.<span class="ruby-identifier">last_lineno</span>
        <span class="ruby-ivar">@snippet</span> = <span class="ruby-ivar">@fetch</span>[<span class="ruby-identifier">nd_lhs</span>.<span class="ruby-identifier">last_lineno</span>]
        <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">nd_lhs</span>.<span class="ruby-identifier">first_column</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">else</span> <span class="ruby-comment"># example: Foo::Bar::C += 1</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_parent_lhs</span>.<span class="ruby-identifier">last</span>.<span class="ruby-identifier">last_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_lhs</span>.<span class="ruby-identifier">last_lineno</span>
        <span class="ruby-ivar">@snippet</span> = <span class="ruby-ivar">@fetch</span>[<span class="ruby-identifier">nd_lhs</span>.<span class="ruby-identifier">last_lineno</span>]
        <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">nd_parent_lhs</span>.<span class="ruby-identifier">last</span>.<span class="ruby-identifier">last_column</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_opcall_for_args" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_opcall_for_args</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>x + 1
    ^</pre>

                              <div class="method-source-code" id="spot_opcall_for_args-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 357</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_opcall_for_args</span>
  <span class="ruby-identifier">_nd_recv</span>, <span class="ruby-identifier">_op</span>, <span class="ruby-identifier">nd_arg</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_arg</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">nd_arg</span>.<span class="ruby-identifier">first_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">nd_arg</span>.<span class="ruby-identifier">last_lineno</span>
    <span class="ruby-comment"># binary operator</span>
    <span class="ruby-identifier">fetch_line</span>(<span class="ruby-identifier">nd_arg</span>.<span class="ruby-identifier">first_lineno</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">nd_arg</span>.<span class="ruby-identifier">first_column</span>
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">nd_arg</span>.<span class="ruby-identifier">last_column</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_opcall_for_name" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_opcall_for_name</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>x + 1
  ^
+x
^</pre>

                              <div class="method-source-code" id="spot_opcall_for_name-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 336</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_opcall_for_name</span>
  <span class="ruby-identifier">nd_recv</span>, <span class="ruby-identifier">op</span>, <span class="ruby-identifier">nd_arg</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">children</span>
  <span class="ruby-identifier">fetch_line</span>(<span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_lineno</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">nd_arg</span>
    <span class="ruby-comment"># binary operator</span>
    <span class="ruby-keyword">if</span> <span class="ruby-ivar">@snippet</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/\G[\s)]*(#{ Regexp.quote(op) })/</span>, <span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">last_column</span>)
      <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">1</span>)
      <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">1</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-comment"># unary operator</span>
    <span class="ruby-keyword">if</span> <span class="ruby-ivar">@snippet</span>[<span class="ruby-operator">...</span><span class="ruby-identifier">nd_recv</span>.<span class="ruby-identifier">first_column</span>].<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/(#{ Regexp.quote(op.to_s.sub(/@\z/, &quot;&quot;)) })\s*\(?\s*\z/</span>)
      <span class="ruby-ivar">@beg_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">begin</span>(<span class="ruby-value">1</span>)
      <span class="ruby-ivar">@end_column</span> = <span class="ruby-identifier">$~</span>.<span class="ruby-identifier">end</span>(<span class="ruby-value">1</span>)
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-spot_vcall" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">spot_vcall</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Example:</p>

<pre>foo
^^^</pre>

                              <div class="method-source-code" id="spot_vcall-source">
            <pre><span class="ruby-comment"># File error_highlight/base.rb, line 399</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">spot_vcall</span>
  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">first_lineno</span> <span class="ruby-operator">==</span> <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">last_lineno</span>
    <span class="ruby-identifier">fetch_line</span>(<span class="ruby-ivar">@node</span>.<span class="ruby-identifier">last_lineno</span>)
    <span class="ruby-ivar">@beg_column</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">first_column</span>
    <span class="ruby-ivar">@end_column</span> = <span class="ruby-ivar">@node</span>.<span class="ruby-identifier">last_column</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


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